A College Paintjob is when you pipe down a girl and before you nut you scream, cum on your hand and with cover her face with that cum. Once the deed is done you leave the building regardless of who owns the house.
Marc: Hey Isaac how was the night with Vanessa?
Isaac: Bro, you wouldn'tbelieve it she would not shut up about astrology so I had to give her a college paint job
Marc: That's crazy bro you just left her to spread eagle in your house. I respect you
When someone (guy or girl) is asleep and a guy jerks off and finishes on them (without them waking) and then they proceeds to take a paintbrush and rub it in.